//package com.example.wastewater.common.biz.user;
//
//import cn.hutool.json.JSONUtil;
//import jakarta.servlet.*;
//import jakarta.servlet.http.HttpServletResponse;
//import lombok.RequiredArgsConstructor;
//import lombok.SneakyThrows;
//import lombok.extern.slf4j.Slf4j;
//import org.springframework.core.io.ClassPathResource;
//import org.springframework.data.redis.core.StringRedisTemplate;
//import org.springframework.data.redis.core.script.DefaultRedisScript;
//import org.springframework.scripting.support.ResourceScriptSource;
//
//import java.io.IOException;
//import java.io.PrintWriter;
//import java.util.Collections;
//import java.util.Optional;
//
///**
// * 用户操作流量风控过滤器
// */
//@Slf4j
//@RequiredArgsConstructor
//public class UserFlowRiskControlFilter implements Filter {
//    private final StringRedisTemplate stringRedisTemplate;
//    private final UserFlowRiskControlConfiguration userFlowRiskControlConfiguration;
//    private static final String userFlowRiskControlLua = "lua/user_flow_risk_control.lua";
//    @SneakyThrows
//    @Override
//    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
//        redisScript.setScriptSource(new ResourceScriptSource(new ClassPathResource(userFlowRiskControlLua)));
//        redisScript.setResultType(Long.class);
//        String username = Optional.ofNullable(UserContext.getUsername()).map(Object::toString).orElse("other");
//        Long result = null;
//        try {
//            result = stringRedisTemplate.execute(redisScript, Collections.singletonList(username), userFlowRiskControlConfiguration.getTimeWindow().toString());
//        }catch (Throwable ex){
//            log.error("用户流量风控lua脚本执行错误", ex);
//            returnJson((HttpServletResponse) servletResponse, JSONUtil.toJsonStr(Results.failure(new ClientException("系统繁忙， 请稍后再试"))));
//        }
//        if(result == null || result > userFlowRiskControlConfiguration.getMaxAccessCount()){
//            returnJson((HttpServletResponse) servletResponse, JSONUtil.toJsonStr(Results.failure(new ClientException("系统繁忙， 请稍后再试"))));
//        }
//        filterChain.doFilter(servletRequest, servletResponse);
//    }
//
//    private void returnJson(HttpServletResponse response, String json) throws Exception {
//        response.setCharacterEncoding("UTF-8");
//        response.setContentType("text/html; charset=utf-8");
//        try (PrintWriter writer = response.getWriter()) {
//            writer.print(json);
//        }
//    }
//}
